CVE-2025-21920 (GCVE-0-2025-21920)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:40 – Updated: 2025-11-03 19:39
VLAI?
Title
vlan: enforce underlying device type
Summary
In the Linux kernel, the following vulnerability has been resolved: vlan: enforce underlying device type Currently, VLAN devices can be created on top of non-ethernet devices. Besides the fact that it doesn't make much sense, this also causes a bug which leaks the address of a kernel function to usermode. When creating a VLAN device, we initialize GARP (garp_init_applicant) and MRP (mrp_init_applicant) for the underlying device. As part of the initialization process, we add the multicast address of each applicant to the underlying device, by calling dev_mc_add. __dev_mc_add uses dev->addr_len to determine the length of the new multicast address. This causes an out-of-bounds read if dev->addr_len is greater than 6, since the multicast addresses provided by GARP and MRP are only 6 bytes long. This behaviour can be reproduced using the following commands: ip tunnel add gretest mode ip6gre local ::1 remote ::2 dev lo ip l set up dev gretest ip link add link gretest name vlantest type vlan id 100 Then, the following command will display the address of garp_pdu_rcv: ip maddr show | grep 01:80:c2:00:00:21 Fix the bug by enforcing the type of the underlying device during VLAN device initialization.
Severity ?
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < 7f1564b2b2072b7aa1ac75350e9560a07c7a44fd (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < fa40ebef69234e39ec2d26930d045f2fb9a8cb2b (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < 0fb7aa04c19eac4417f360a9f7611a60637bdacc (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < 5a515d13e15536e82c5c7c83eb6cf5bc4827fee5 (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < 3561442599804905c3defca241787cd4546e99a7 (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < 30e8aee77899173a82ae5ed89f536c096f20aaeb (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < b6c72479748b7ea09f53ed64b223cee6463dc278 (git)
Affected: 22bedad3ce112d5ca1eaf043d4990fa2ed698c87 , < b33a534610067ade2bdaf2052900aaad99701353 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.35
Unaffected: 0 , < 2.6.35 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.131 , ≤ 6.1.* (semver)
Unaffected: 6.6.83 , ≤ 6.6.* (semver)
Unaffected: 6.12.19 , ≤ 6.12.* (semver)
Unaffected: 6.13.7 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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\"https://git.kernel.org/stable/c/3561442599804905c3defca241787cd4546e99a7\"}, {\"url\": \"https://git.kernel.org/stable/c/30e8aee77899173a82ae5ed89f536c096f20aaeb\"}, {\"url\": \"https://git.kernel.org/stable/c/b6c72479748b7ea09f53ed64b223cee6463dc278\"}, {\"url\": \"https://git.kernel.org/stable/c/b33a534610067ade2bdaf2052900aaad99701353\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvlan: enforce underlying device type\\n\\nCurrently, VLAN devices can be created on top of non-ethernet devices.\\n\\nBesides the fact that it doesn\u0027t make much sense, this also causes a\\nbug which leaks the address of a kernel function to usermode.\\n\\nWhen creating a VLAN device, we initialize GARP (garp_init_applicant)\\nand MRP (mrp_init_applicant) for the underlying device.\\n\\nAs part of the initialization process, we add the multicast address of\\neach applicant to the underlying device, by calling dev_mc_add.\\n\\n__dev_mc_add uses dev-\u003eaddr_len to determine the length of the new\\nmulticast address.\\n\\nThis causes an out-of-bounds read if dev-\u003eaddr_len is greater than 6,\\nsince the multicast addresses provided by GARP and MRP are only 6\\nbytes long.\\n\\nThis behaviour can be reproduced using the following commands:\\n\\nip tunnel add gretest mode ip6gre local ::1 remote ::2 dev lo\\nip l set up dev gretest\\nip link add link gretest name vlantest type vlan id 100\\n\\nThen, the following command will display the address of garp_pdu_rcv:\\n\\nip maddr show | grep 01:80:c2:00:00:21\\n\\nFix the bug by enforcing the type of the underlying device during VLAN\\ndevice initialization.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.291\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.235\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.179\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.131\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.83\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.19\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.7\", \"versionStartIncluding\": \"2.6.35\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"2.6.35\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:24:34.859Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21920\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T19:39:13.839Z\", \"dateReserved\": \"2024-12-29T08:45:45.788Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-01T15:40:54.595Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.